Extension lamp bracket



2 Sheets-Sheet 1 L l I Nov. 24, 1936. .v. VAVRO EXTENSION LAMP BRACKET Filed Jan. 17, 1936 P201 07 I Zzvra Nov. 24, 1936. v. VAVRO EXTENSION LAMP BRACKET Filed Jan. 17, 1936 2 Sheets-Sheet 2 Vi'al ar Vkvro Patented Nov. 24, 1936 UNITED STA'i'Eifi maria PATENT OFFICE EXTENSION LAMP BRACKET Victor Vavro, Pittsburgh, Pa. Application January 1'7, 1936, Serial No. 59,621

8 Claims.

This invention relates to certain new and useful improvements in extension lamp brackets.

The primary object of the invention is to provide an extension lamp bracket wherein a lamp is carried by a bracketthat is movably mounted relative to a support with tension means associated with an electric cord or conductor that is in communication with the lamp for retaining the cord or conductor in a substantially taut condition at all times regardless of the adjustment of the bracket relative to the support, the bracket permitting various adjustments of a lamp whereby light raysmay be cast in the desired direction. A further object of the invention is to provide an extensible lamp bracket of the foregoing character wherein a hanger or support may depend from a room ceiling or project from a room wall with a bracket carrying the lamp adjustably mounted on the support and with tensioning means for the lamp cord associated with the lamp located within the support and operated to retain the lamp cord in a taut condition irrespective of the position of the lamp and bracket relative to the support.

With the above and other objects in view that will become apparent as the nature of the invention is better understood, the same consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claimed.

In the drawings:-

Figure 1 is a side elevational View of an extensible lamp bracket constructed in accordance with the present invention, the bracket being illustrated in an angular position relative to its carrier or support that is in the form of a ceiling hanger;

Figure 2 is a detail sectional view taken on line 2-2 of Figure 1, showing the lock devices for retaining the lamp bracket rod in adjusted position;

Figure 3 is a detail sectional view taken on line 33 of Figure 1, showing the swivel ring mounting for the lamp bracket rod on the lower end of the hanger cylinder;

Figure l is a detail sectional view taken on line 44 of Figure 2, showing the lock device for retaining the lamp bracket rod in extended position;

Figure 5 is a vertical longitudinal sectional view through the hanger support or cylinder showing the tensioned electric cord take-up within the cylinder;

Figure 6 is a cross-sectional view taken on line 6-4 of Figure 5, showing the slide on the rack bar with the tensioning device for the cord takeup carried by the slide;

Figure 7 is a cross-sectional view taken on line 1-7 of Figure 6, showing the spring mounting for the gear that places the gear under tension when moved over the rack bar; and

Figure 8 is a detail sectional view taken on line 88 of Figure 5, showing the strap device for holding the shaft to which one end of the tensioning device is attached against rotation during movement of the gear wheel and cord guide pulley.

Referring more in detail to the accompanying drawings, the reference character In designates a v support for a lamp, the support being in the form of a hanger cylinder depending from a room ceiling ll. A pair of adjustable bracket rods !2 is supported on the lower end of the hanger cylinder H), the outer ends of the rods 12 supporting a lamp socket l3. The bracket rods l2 are longitudinally adjustable relative to the lower end of the hanger cylinder, means being provided for varying the angularity of the rods 12 relative to the hanger cylinder and also for adjustments thereof rotatably of the hanger cylinder.

The appurtenances of the bracket rods 12 and their mountings are shown in Figure 5 and include a ring 14 that is swiveled on the lower end of the hanger cylinder ill by means of bordering bands l5 anchored to the hanger cylinder IU as at It. A pair of diametrically opposite studs ll and I8 is anchored by means of a key [9 to the swivel ring l4 and the studs rotatably support blocks and 2| respectively. The bracket rods I2 slidably extend through openings 22 in the blocks 20 and 2| and the studs I! and I8 have circumferential cut-away portions 23 to permit rotatable adjustment of the blocks 28 and 2t on the studs I1 and i8 and a corresponding angular adjustment of the bracket rods l2 relative to the hanger cylinder ID, the rods l2 being also longitudinally adjustable through the blocks 26 and 2 l.

The inner ends of the rods I? are connected by an arcuate strap 24 to maintain parallelism of the two bracket rods and the outer ends of the bracket rods l2 carry a cross-pin 25 for the pivotal support of the lamp socket it.

To retain the bracket rods H2 in longitudinally adjusted positions relative to the blocks 2E] and 2i, a lock device is associated with the rod 12 that passes through the block 2! and as shown in Figure 4, a split screw clamp 26 surrounding the rod 52 is secured to the block 2! and is moved into binding engagement with the rod l2 by means of a nut 21 threaded thereon. The angular adjustment of the bracket rods I2 relative to the hanger cylinder Ill is accomplished by means of a latch key 28 that is pivotally mounted as at 29 upon a projecting reduced end of the stud I8, the latch key being selectively receivable in notches or grooves 30 formed in the outer face of the block 2|. The bracket rods I2 move through the circumferential grooves 23 in the studs I1 and I8 and may assume any angular position relative to the hanger cylinder Ill within the limits of a number of notches or grooves 39 formed in the outer face of the block 2|. An extended adjustment of the bracket arms I2 is shown in Figure 1 and the same are illustrated in their fully retracted positions in Figure '5, with the strap 24 carried by the inner ends of the arms disposed adjacent the hanger cylinder III with the rod I2 extending longitudinally of and parallel with the hanger cylinder.

The upper and lower ends of the hanger cylinder are closed by insulation blocks 3! and 32 respectively and the lamp cord 33 that extends from a source of electrical energy passes through an opening in the block 3| at the upper end of the hanger cylinder, the cord 33 extending downwardly through the cylinder for passage through openings in the lower block 32 and then extends upwardly into the cylinder as at 33a. The lamp cord 33 is anchored at 34 to the lower block 32 and the lamp cord section 33a extends upwardly through the cylinder, over -a pulley '35 and then downwardly through an opening in the lower block32 for electrical connection with the lamp socket I3. The pulley35 is normally retained'at its limit of upward movement in the hanger cylinder I so that the lamp cord sections 33a are always maintained ina substantially taut condition with no slack therein irrespective of the position of the lamp socket I3 relative to the lower end of the hanger cylinder Ill. To retain the pulley 35 at its limit of upward movement in the hanger cylinder and under restraint of the lamp cord sections 33a, there is provided a rack bar 31 extending longitudinally within the cylinder and anchored at its end as at 38 to the :end closure blocks 3| and 32 of the hanger cylinder.

As shown moreclearly in Figures to 8, a slide 39 is mounted on the rack bar 3'! and carries a plate extension 40 that supports one end of the shaft 4I upon which the pulley 35 is freely rotatable. A gear wheel 42 is formed integral with a side flange of the pulley 35 and has an open side thereof closed by the slide plate 49 as shown in Figures 6 and 8. A disk enlargement 43 is carried by the shaft 4I Within the hollow gear 42 and said disk portion 43 is surrounded by a coil spring 44, one end of which is anchored as at 45 to the inner face of the gear 42 while the inner end of the coil spring 44 is anchored as at 46 to the disk enlargement 43. The slide 39 is provided with a cut away portion to permit tight engagement of the gear 42 with the rack bar 31. As shown more clearly in Figures 5 and 8, a U-shaped strap 41 has the head thereof extending through a cut portion 48 at the upper movements, the electric cord 33a is drawn from the hanger cylinder I0 which causes a lowering movement of the tensioning device comprising the pulley 35 and gear wheel 42 within the hanger cylinder. The rotary movement of the gear 42 places the coil spring 44 under tension so that when the bracket rods I2 are returned to the position shown in Figure 5, the slide 39 carrying the gear wheel and pulley in the hanger cylinder takes up any slack in the electric cord 33a. When it is desired to adjust the bracket rods I2 angularly with respect to the hanger cylinder as shown in Figure l, the latch key 28 is disengaged from the groove 33 in the block 2I and pivotal movement of the rods I2 'on the studs I! and I8 is permitted. Also, the swivel ring I4 permits rotatable adustment of the bracket rods relative to the hanger cylinder.

From the above detailed description of the invention, it is believed that the construction and operation thereof will at once be apparent and while there is herein shown and described the preferred embodiments of the invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

I claim:-

1, In an extension lamp bracket, a hanger cylinder, a pair of bracket rods extensibly, pivotally and swivelly carried by the lower end of the hanger cyinder with the rods respectively mounted at opposite sides of the cylinder, a lamp socket at the outer ends of the bracket rods, an arcuate strap connecting the other ends of the bracket rods and adapted to partly surround the hanger cylinder for bracing the rods when the rods are aligned with the cylinder, an electric cord having a looped portion in the hanger cylinder and attached to the lamp socket and a tensioned slack take-up device in the hanger cylinder for the looped portion of the cord for maintaining the cord in a substantially taut condition during adjustments of the bracket rods.

2. In an extension lamp bracket, a hanger cylinder, bracket rods extensibly, pivotally and swivelly carried by the lower end of the hanger cylinder, a lamp socket at the outer end of the bracket rods, an electric cord having a looped portion in the hanger cylinder and attached to the lamp socket and a tensioned slack take-up rods further including a ring swivelled on the lower end of the cylinder, a pair of diametrically opposite studs on the ring and a block rotatable on each stud and through which the bracket rods extend.

3. In an extensible lamp bracket, a hanger cylinder, bracket rods extensibly, pivotally and swivelly carried by the lower end of the hanger cylinder, a lamp socket at the outer end of the bracket rods, an electric cord having a looped portion in the hanger cylinder and attached to the lamp socket and a tensioned slack take-up device in the hanger cylinder for the looped portion of the cord for maintaining the cord in a substantially taut condition during adjustments of the bracket rods, the mounting for the bracket rods further including a ring swivelled on the lower end of the cylinder, a pair of diametrically opposite studs on the ring and a block rotatable on each stud and through which the bracket rods extend, the outer end of a block having radial slots therein and a latch key pivoted onto the outer end of the stud for selective reception in a slot for holding the blocks in adjusted positions.

4. In an extensible lamp bracket, a hanger cylinder, bracket rods extensibly, pivotally and swivelly carried by the lower end of the hanger cylinder, a lamp socket at the outer end of the bracket rods, an electric cord having a looped portion in the hanger cylinder and attached to the lamp socket and a tensioned slack take-up device in the hanger cylinder for the looped portion of the cord for maintaining the cord in a substantially taut condition during adjustments of the bracket rods, the mounting for the bracket rods further including a ring swivelled on the lower end of the cylinder, a pair of diametrically opposite studs on the ring and a block rotatable on each stud and through which the bracket rods extend, the outer end of a block having radial slots therein and a latch key pivoted onto the outer end of the stud for selective reception in a slot for holding the blocks in adjusted positions, and a split sleeve and nut associated with one rod and block for holding the rods in extensibly adjusted positions.

5. In an extensible lamp bracket, a hanger cylinder, bracket rods extensibly, pivotally and swivelly carried by the lower end of the hanger cylinder, a lamp socket at the outer end of the bracket rods, an electric cord having a looped portion in the hanger cylinder and attached to the lamp socket and a tensioned slack take-up device in the hanger cylinder for the looped portion of the cord for maintaining the cord in a substantially taut condition during adjustments of the bracket rods, the slack take-up device including a rack bar extending longitudinally of the cylinder, a slide on the rack bar, a non-rotatable shaft carried by the slide, a connected gear and pulley freely rotatable on the shaft with the looped portion of the cord traversing the pulley and the gear meshing with the rack bar and a spring connection between the shaft and gear adapted for tensioning the spring when the slide moves towards the lower end of the cylinder and to effect upward movement of the slide in the cylinder when the outer end of the bracket rods are moved toward the lower end of the cylinder.

6. In an extension lamp bracket, a hanger cylinder, bracket rods extensibly, pivotally and swivelly carried by the lower end of the hanger cylinder, a lamp socket at the outer end of the bracket rods, an electric cord having a looped portion in the hanger cylinder and attached to the lamp socket and a tensioned slack take-up device in. the hanger cylinder for the looped portion of the cord for maintaining the cord in a substantially taut condition during adjustments of the bracket rods, the mounting for the bracket rods further including a ring swivelled on the lower end oi": the cylinder, a pair of diametrically opposite studs on the ring and a block rotatable on each stud and through which the bracket rods extend, the slack take-up device including a rack bar extending longitudinally of the cylinder, a

slide on the rack bar, a non-rotatable shaft carried by the slide, a connected gear and pulley freely rotatable on the shaft with the looped portion of the cord traversing the pulley and the gear meshing with the rack bar and a spring connection between the shaft and gear adapted for tensioning the spring when the slide moves towards.

the lower end of the cylinder and to effect upward movement of the slide in the cylinder when the outer end of the bracket rods are moved toward the lower end of the cylinder.

'7. In an extensible lamp bracket, a hanger cylinder, bracket rods extensibly, pivotally and swivelly carried by the lower end of the hanger cylinder, a lamp socket at the outer end of the bracket rods, an electric cord having a looped portion in the hanger cylinder and attached to the lamp socket and a tensioned slack take-up device in the hanger cylinder for the looped portion of the cord for maintaining the cord in a substantially taut condition during adjustments of the bracket rods, the mounting for the bracket rods further including a ring swivelled on the lower end of the cylinder, a pair of diametrically opposite studs on the ring and a block rotatable on each stud and through which the bracket rods extend, the outer end of a block having radial slots therein and a latch key pivoted onto the outer end of the stud for selective reception in a slot for holding the blocks in adjusted positions, the slack take-up device including a rack bar extending longitudinally of the cylinder, a slide on the rack bar, a non-rotatable shaft carried by the slide, a connected gear and pulley freely rotatable on the shaft with the looped portion of the cord traversing the pulley and the gear meshing with the rack bar and a spring connection between the shaft and gear adapted for tensioning the spring when the slide moves towards the lower end of the cylinder and to effect upward movement of the slide in the cylinder when the outer end of the bracket rods are moved towards the lower end of the cylinder.

8. In an extensible lamp bracket, a hanger cylinder, bracket rods extensibly, pivotally and swivelly carried by the lower end of the hanger cylinder, a lamp socket at the outer end of the bracket rods, an electric cord having a looped por-- tion in the hanger cyiinder and attached to the lamp socket and a tensioned slack take-up device in the hanger cylinder for the looped portion of the cord for maintaining the cord in a substantially taut condition during adjustments of the bracket rods, the mounting for the bracket rods further including a ring swivelled on the lower end of the cylinder, a pair of diametrically opposite studs on the ring and a block rotatable on each stud and through which the bracket rods extend, the outer end of a block having radial slots therein and a latch key pivoted onto the outer end of the stud for selective reception in a slot for holding the blocks in adjusted positions, and a split sleeve and nut associated with one rod and block for holding the rods in extensibly adjusted positions, the slack take-up device including a rack bar extending longitudinally of the cylinder, a slide on the rack bar, a non-rotatable shaft carried by the slide, a connected gear and pulley freely rotatable on the shaft with the looped portion of the cord traversing the pulley and the gear meshing with the rack bar and a spring connection between the shaft and gear adapted for tensioning the spring when the slide moves to wards the lower end of the cylinder and to effect upward movement of the slide in the cylinder when the outer end of the bracket rods are moved towards the lower end of the cylinder.

VICTOR VAVRO. 

